When you downloaded it's in a folder with lots of other folders. To change the background you go to textures and rename the pic you want bg (there's already a pic called bg so you replace it) For music you got to the sound folder and there should be a text document which tells you how. Basically the ones you change are song.mp3 song-advantage.mp3 song-disadvantage.mp3 and also menu.mp3 I don't know if it's pc only though D: You can also change the card backs if you want and pretty much anything